@elena

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You helped me with this question earlier today, the answer you got was incorrect, i tried looking through your calculations but i cant find the mistake. the program wont let me see the right answer just tells the answer i put in was wrong. can you please look over it again thank you


Extreme-sports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910m in Yosemite National Park. Assume a jumper runs horizontally off the top of El Capitan with speed 5.0m/s and enjoys a freefall until she is 150m above the valley floor, at which time she opens her parachute .

Q: how long is the jumper in freefall? ignore air resistance

  • @elena -

    Without air resistance, the horizontal velocity does not matter.
    The free fall is over a vertical distance of 150-910=-760m
    S=v0t-(1/2)gt² where v0=0
    t=sqrt(-2S/g)
    =sqrt(2*760/9.81)
    =12.45 s.

  • @elena -

    h=H-H(o) =910-150 =760 m/s
    h=g•t^2/2,
    t=sqrt(2•h/g) = sqrt(2•760/9.8)=
    =sqrt (155)=12.45 s.

  • @elena -

    thank you.

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